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Hey guys and gals - I got the week to wait before Ecos. And I am really lacking any sense of motivation to go grab my textbook and do some study (which isn't that unusual for me lol). The fact is I'm a talker rather than a writer - that's how I learn best. So if any fellow Ecos-students would...

I can remember that if its the line, and the angle it makes with the axis its just tan@=m But what is the formula for the angle created by two intersecting lines???